Control system for motor-driven spinning frames



Feb. 7, 1928. 1,658,652

R. REGNAULT CONTROL SYSTEM FOR MOTOR DRIVEN SPINNING FRAMES Filed March 13, 1925 Inventor: Ren Regnaultz His Annorriey.

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Patented Feb. 7, 1925.

"tihllTED ST TE S PATENT OFFICE.

REGNA'ULT, OF LI'LLE, FRANCE, ASSIGNOR T0 GENERAL ELECTRIC COMPANY, A.

CORPGBATION OF NEW] YORK.

CONTRQL SYSTEM FOR MOTOR-DRIVEN SPINNING FRAMESL" Application filed March 13, 1925, Serial No. 15,330, and in France-April 1B, 1924.

in accordance with the movement of the ring rail of the spinnino' machine so as to maintain the tension or. the yarn substantially constant.

The yarn spun on ring spinning frames generally is wound on bobbins ortuloes in conical layers with the threads slightly crossed in order-to enable unwinding, to take place easily without entanglement To this end, the yarn is guided up and down alorg the rotatil'ig spindles by the ring rail which 'ierforms a reciprocating up and down inotion. At the beginning of the spinning, a conical base must be wound on the bare tube or hohloin unless the bobbin itself is formed with a conical base. On'the top of thishase. a cop is then built up with the layers of thread normally arranged in conical shape. lhis requires that the ring rail he. raised or advanced by the thickness of one layer after each up 'andklown reciprocating motion. in the ordinary form of ring spin ning frame, this is accom iilished l v means of the builder or (topping motion frame which is reciprocatcd by an eccentric cam or copping plate and a ratchet wheel which moved forward one step ateach reciprocation ofthe frame and is arranged to raise or advance the ring rail upon the completion of each layer.

It is Well known that in the operation of continuous ring spinning framesof the above character. the yarn tension varies inversely with the height of the ring rail above the lowest position and inversely with the par ticular diameter in the layer upon which the yarn is being wound. Hence, in order that the thr ad maybe smoothly wound in reg lar layers in a conical bobbin, itis necessaryto correct the variations in tension due to both the change in direction of the pull of the thread upon the traveler or ring as well as for the variation due to the gradual decrease in length of the balloon thread as the hohhin is built up from starting until fldoffingfl lihile heretofore it has been proposed to vary the speed of both alternatingcurrent and direct current driving motorsof spinning frames in widely diiferent wa vs howrect current t vpe (/rdinaril'y after starting a shunt wound direct current motor driven spinning frame in the unheated condition there will he a gradual increase in the operating speed of the spinning frame due on the one hand to the heatingof the field. windings of the drivingai'notor and on the other hand to the decrease in power required to drive the spinning frame after it is once set into opera tion. sion on the yarn, the properopcrating speed of the driving motor continuously varies during the different phases of winding the bobbin and dependsprimarily upon the following" factors :-lirst.v the nature of the thread being manufactured; second, the location of the thread layer in th'e'bobbinas determined by the level or height of the ring rail and third, the position of the particular spire or turn in the layer.

The present invention provides a novel form of controlling means which is well adapted for controlling; direct current motor driven spinning frames or the like whereby the proper operating speed may he obtained under all of the .varving phases of operation just enumerated. To insure against speed variations due to heating of the field Wind ing of direct current motors, field magnets having windings of ample current carrying and heat dissipating 'capacityare provided, and if desired aditferential connectedseries Winding may be provided to compensate for the variations of speed resulting from variations in the load imposed upon the driving motor. In carrying the present invention into effect in a preferred form, a novel form of circuit controlling switch mechanism is operatively connected to the regulating gear of the spinningframe and the switch mechanism is arranged to control iiore-over, to maintain constant tenspeed controlling resistors connected in circult with the drivmg motor 111 such manner that the motor speed is successively increased anddecreased between progresslvely variable limits according to the particular re quirements of the various phases of operation of the spinning frame. The preferred form of controlling switch mechanism Ior the driving motor comprises a pair of independently operable circuit controlling members, one of which is arranged to control a short circuit around successive sections of a speed controlling resistor for the driving motor in accordance with the rise and fall of the ring rail otthe spinning machine and the other of which is arranged to independently control a short circuit around successive sections of the same speed controlling resistor in accordance with the advance of the ring rail of the spinning machine. In this way, progressively increasing number of sections of the speed controlling resistor are placed under the control of the first c1rcu1t controlling member as the bobbin is built up and consequently the motor speed is'varied between progressive lyvariable limits. For a better understanding of my invention, reference is had to thefollowing de scription taken inconnection with the accompanyin g drawing 111 which the singlefi'gure diagrammatically illustrates a direct current motor driven spinning frame control system embodying my invention for the purpose of explaining the principles thereof. Referring to the drawing, it will be seen that I have illustrated only such parts of the spinning frame as seem essential'for the disclosure of my invention since spinning frames are old and well known and my invention does not depend in any way on the particular construction of thespmning machme. However, in the drawing it will be seen that 10 represents the cop or bobbin into which the thread is wound under the control of the usual form of ring traveller which ismounted upon the ring rail carriage 11. The ring rail carriage 11 is mechanically connected to be oscillated up and down by the eccentric or copping plate 12 and it will be understood that the ring rail carriage 11 is periodically advanced relatively to the bobbin 10 after the completion of each layer by any of the well known forms of spinning frame mechanisms.

The spinning frame driving motor 13 isshown as of the direct current compound wound type having a shunt field winding 14 and a series field winding 15 and is mechanically connected through suitable gearing to drive the operating mechanism of the ring rail 11 as well as to rotate the bobbin 10 at high speed. A starting controller 16 which may be of the drum type illustrated is provided for controlling the connection of the series winding 15 in the armature circuit of motor 13 as well as for controlling the motor starting resistor 17 aswill be more fully described in oonnection with th operation of the control sys tem embodying my invention.

In order to control the operating speed of motor 13, in accordance with my invention the circuit controlling mechanism 18 is provided for regulating the speed control- 1 ling resistors 19 and 20 which are connected in circuit with the shunt field winding let of the motor 13. In the preferred form illus trated in the drawing, the circuit controlling mechanism 18 comprises essentially the sliding circuit controlling devices 21, 22 and It will be observed that the circuit controlling device 21 is electrically connected to control a short circuit around successive sections of the speed controlling resistor 15) and is nleclumically connected through a suitable weighted cord, pulley, and lever mechanism to be actuated by the eccentric 12 responsively to the rise and fall oi the ring rail carriage 11. Furthermore,

it will be observed that the circuit control-' ling devices 22 and 23 aremechanically connected to be simultaneously operated in accordance with the advance of the ring rail carriage 11. through the agency ol a suitable cord and pulley operating mechanism as indicated in the drawing. As shown, the cord of the operating mechanism is provided with a pair of adjustable stops 24; and 25 which are disposed in the path of travel of the ring railcarriage 11.

The manner; in which the independently movable circuit controlling devices 21 and cooperate to jointly control the speed regulating resistor 19 as well as the manner in which the circuit controlling device 23 operates to control the speed controlling resistor 20 will better be understood from the following description oi? the operatirm of the spinning frame control system illuslratml in the drawing.

ll itll the direct current supply lines, indicated as plus and minus in the drawing. energized from a suitable source, motor 13 may be started and accelerated to normal operating speed by operation of the controller 16 through itssuccessive controlling positions 1 to (3 indicated in the drawing. In this way, the series winding 15 initially connected to act cumulatively with the shunt field winding 14: in order to increase the torque o'l? motor 13 during the starting period in which the successive sections oi the starting resistance 17 are short circuitcd by the controller 16. It will be observed, however, that in the sixth or full speed running position of controller 16. theseries winding 15 is connected differentially with the shunt field winding 14 to compensate for variations in the load imposed upon the motor.

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notches l lith the operating parts of the circuit controlling switch mechanism 18in their respective positions in which they are shown in the drawing, the resistor 19 is entirely short circuited by the circuit controller while toe resistor 20 is inserted in the shunt field circuit of driving motor 13. Under these conditions the motor speed is regulated by means of the manually operated rheostat 28 to the proper alue for the winding of the yarn upon the bobbin 1() in the initial or bunch The subsequent operation or the automatic motor speed control arrange- .ment is as follows :-W hen a filling winding is being wound. upon the bobbin 10, the ring rail carriage 11 is oscillated only a slight degree by the eccentric or copying plate 12 during the formation of thebunch upon the lower end oi? bobbin 10. During this operation the movement of the ring rail carriage i1 is not sullicient to engage with the stop and, consequently, the circuit controlling member as well as the circuit controlling member 23 remain in the position in which tl \y are shown in the drawing. It will be understood, however, that the circuit controlling member 21 is oscillated betweenthc stationary contacts 26 and 27 cooperating therewith res 'ionsively to the oscillation of the ring rail carriage 11.

r ctter the completion of the winding of the bunch, the advance of the ring rail carriage 11 is started by means of suitable mechanism which is not shown in the draw- 1 At the same time the oscillation of the rail carriage 11 by the eccentric 12 continues thus producing a combined back and forth motion of the ring rail carriage 11 w ith the limits of motion gradually advancing the bobbin is built up. During this phase of winding of the yarn upon the bobbio it), the current controlling device 18 becomes effective to control the speed of motor as to maii'itain a substantially constant tr ion upon the yarn as it is Wound upon the bobbin; As the limits of oscillation of the ring rail carriage 11 advances, the stop ei'ig'aged by the ring rail carriage 11 so as to correspondingly raise the slide of circuit coi'itrolling device 22 and thereby remove the short circuit around successive seclions ot the speed controlling resistor 19. in this way, iirst one, then two, and then progressively increasing numbers of the sections of resistor 19 are placed under the control of the oscillating slide of circuit controlling device 21. Thus, when the successive layers of yarn are wound upon the bobbin 10, the speed of driving motor 13 is automatically increased when the layer is wound upon the full diameter of the bobbin and is automatically decreased when the thread is wound upon the inner diameter of the bobbin and the limits between which the speed of motor 13 is varied are progressively increased correspondingly with the advance of the ring rail 11. This progressive variationtion required to short circuit the successive sections of auxiliary speed controlling resistor 20. This serves to vary the ei'iergizing current of the shunt field winding i l of the motor so as to gradually decrease the limits within which the speed is varied by the slide of circuit controlling device 21 to compensate for the decreased length or" the bail.- loon thread.

When the bobbin is complete, the slides of circuit controlling devices 22 and 23 are brought back to the initial position in which they are shown in the drawing, upon the lowering of the ring rail carriage 11 preparatory to subsequent winding of additional bobbins in the trimmer previously described.

in accordance with the provisions of the patent statutes, I have described the principlc of operation of my invention together with the apparatus which I now consider to represent the best embodiment thereof, but I would have it understood that the apparatus shown is only illustrative and that the invention may be carried out by other means.

lVhat I claim as new, and desire "to secure by Letters Patent of the United States,

1. In a motor control system for spinning machines and the like, the combination of an electric motor for driving the machine, a speed controlling resistor in circuit with the motor, a pair of independently operable circuit controlling devices each connected to separately control a short circuit around successive sections of said resistor, and means oporatively connecting the motor with said devices to operate the same to successively insert and remove a progressively increasing number of sections of the said resistors in the motor circuit and thereby successively vary the motor speed between progressively variable limits.

2. In a motor control system for spinning machines and the like, the Vcon'ibination of an electric motor for driving the machine, a speed controlling resistor in circuit with the motor, a pair of independently operable circuit controlling devices, each connected to separately control a short circuit around successive sections 01 said resistor and means operatively connecting the motor with one of said devices to operate the same to open and close the short circuit around the said successive sections of said resistor in a predetermined sequence and means operatively connecting the motor with the other 01? said devices to operate the same to open the short lGU circuit around the said successive sections of said resistor in a different sequence whereby the motor speed is successively varied between progressively variable limits.

3. In u motor controlsystem for spinning;

machines and the like, the combination of an electric motor for driving the machine, :1 speed controlling resistor 111 circuit with the motor, :i circuit controlling device operz1- tively connected with the motor to be operated thereby and arranged to periodically establish and interrupt a short circuit around successive sections of said resistor during the operation of the motor, and a second circuit controlling device operatively connected wlth the motor to beoperzitedthereby and arranged to successively interrupt :1 n inde- RENE REGNMJLT. 

